Fuse.



WALLACE L. COOK, OF CHICAGO, ILLINOIS.

FUSE.

Specification of Letters Patent.

Patented Jan. 29, 1918.

Application filed February 9, 1917. Serial No. 147,546.

' To all whom it may concern Be it known that I, lVALnAcn L. Coon, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented acertain new and useful Improvement in Fuses, of whi h the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to fuses and more particularly to that style of fuses in which the'fuse wire is carried in a strip of in- :sulatingmaterial, preferably wood.

The construction of my improved fuse contemplates preferably a flattened 'piece of 'wood provided with a slot within which the fuse wire is mounted. In constructionssuch as this it is desirable to have the extremities of the fuse wire visible so that it may be seen whether the wire is intact, or not. 'I he :fuse wire that is employed is of a very small diameter and is very delicate. IiIetal terminals are employed for the strips of wood when such are used, and the fuse wire is hlectrically connected to these metal end strips or caps. Great care must be taken in the manufacturing of the fuse so that the :fuse wire is not injured when it is mounted in place and soldered to the end caps. If the fuse wire were withdrawn-over a sharp edge its cross section would'vcry likely be reduced and the rupture of the fuse would occur under conditions other than its rated capacity. Furthermore, these fuses must be so constructed that new fuse wire may be readily inserted after the original fuse wire has been blown.

In order to secure a construction so that the fuse wire will not be damaged at its extremities, I so arrange this structure so that the fuse wire finds its sharpest bend over the wood, rather than over the metal, thus eliminating the tendency to injure the fuse. The holes in the end cap through which the fuse projects likewise is left unfilled so that these holes need not have their solder cleaned out when a new fuse is to be inserted. For this purpose I carry the fuse wire along the end face of the end cap and solder the wire somewhat below the opening through which it passes, thus permitting refill ng, without having to burn out the old soider.

I will explain one form which my invention may take more in detail by reference to the accompanying drawing, in which- Figure l is a perspective view of a fuse block showing two of my improved fuses in place;

Fig. 2 is an enlarged longitudinal sectional view of half of the eucil fuse;

Fig. 3 is an enlarged en view of my improved fuse;

Fig. 1 is a form of end blank be desirably employed, and

Fig. 5 is asectional view on line 5-5 of Fig. 2.

In Fig. 1, I show a block of insulating material adapted to support a plurality of fuses 11 of my improved design. These fuses are as customary mounted in terminal which may clips 12, 12. The view of Fig.1 shows the fuse used for a basis in this application, this fuse having a size approximately of three auda half inches long, the width :1 halfan inch, and a thickness of tln'ee-sixteenths of an inch. As will be seen the fuse lends itself very readily of course to mounting so that a great many fuses (an be accommodated in a small space. I do not mean by these di mensions to limit myself to any particular size, but give the dimensions merely as indicative of the fuse illustrated herein, in vicwof the fact that the remaining figures are enlarged Views of the fuse of this particular form.

Referring more particularly to Figs. 2, 3 and 5, my improved pencil fuse here hown consists of the wooden base plate 13 having a slot 14 therein. A fuse wire 15 is carried in the slot. End caps 16 are provided at opposite extremities of the wooden base plate 13 and these end caps are preferably constructed of a blank 16' .shown in Fig. 4, which blank is suitably formed in the shape of a cup and then is slidover the extremities of the wooden base plate, so that by prick punching as shown at 17 these end caps are secured in place.

These end caps are provided with holes 18, which holes are of reasonable size, which holes are so positioned that the slot 14, extends only part way across the face of the holes, as more clearly apparent from Figs. 2 and 3. By reason of this the fuse wire 15 when it is bent outwardly over the face of the end cap finds its sharpest turn across the edge of the wood and not against the edge of the metal. The fuse wire is then only slightly bent where it again engages the periphery of the hole 18, all as more clearly apparent from Fig. 2. The. extremities of the fuse wire are then soldered as at 19 upon the end face of the end cap. In this way the holes 18 are left open and when it gisdesired to replace a blown t'use it is not necessary, to clean out these holes.

Furthermore, the construction is such that 2x5,i's readily apparent from the figures, that the mounting of these fuses in terminal clips I has no tendency to break the fuse wire or in any way injure it. The fuse wire is lirmly secured in position, and in fact it may be drawn rather taut in view of the Fact that it is bent over the edge of wood, thus making it possible to avoid any looping exteriorly of the end caps.

Furthermore, by exposing the point of soldering it is at all times possible to see whether the wire has been damaged due to the undue heat caused by the instrumentali ties used in the soldering operation,

The advantages of the construction thus outlined will be ieadily apparent, as will also its application to other forms or modifications. Having however thus described one form which my invention may take, what I claim as new and desire to secure by Letters Patent is:

1. A fuse of the character described comprising a flat insulating shell, a duct longitudinaliy of said shell, end caps for sald shell,a d a fuse wire in said duct, said end caps havin holes out of register with said duct where y the extremities of said fuse wire may be bent over the edges of said shell at said duct to thus extend along the end faces of said end caps, said extremities be ing soldered to said end faces.

2. A fuse of the character described comprising a flat insulatim shell, a duct longitudinally of said shell end caps for said shell, and a fuse wire in said duct, said end caps having holes therethrough, the extremities of said fuse wire extending through said holes along the end faces of said caps, said extremities being soldered to said end faces away from said holes.

3. 'A fuse of the character described comprising a-flat iusulatin shell, a duct longiiudinally of said shelT, end caps for said shell, and a fuse wire in said duct, said end raps havin holes out of register with said duct where )y the extremities of said fuse wire may be bent over the edges of said shell at said duct to thus extend along the end faces of said end caps, said extremities being soldered to said end faces, said end caps consisting of punchings fitting said shell and being secured thereto by prick punched protusions.

-t. A fuse of the character described com prising a flat insulating shell, a duct longitudinally of said shell, end caps for said shell, and a fuse wire in said duct, said end caps having holes therethrough, the extremities of said fuse wire extending through said holes along the end faces of said caps, said extremities being soldered to said end faces away from said holes, said end caps eonsisting of punchings fittin said shell and being secured thereto by prick punched protrusions.

In witness whereof, I hereunto subscribe my name this 6th day of February, A. D., 1917.

WALLACE L. COOK.

\Vitnesses:

HAZEL A. JONES, Max 7. ZABEL. 

